Who's your favorite popular atheist?
It has to be Douglas Adams.
"I refuse to prove that I exist," says God, "for proof denies faith, and without faith I am nothing."
"But," says Man, "the Babel fish is a dead giveaway, isn't it? It could not have evolved by chance. It proves that You exist, and so therefore, by Your own arguments, You don't. QED"
"Oh dear," says God, "I hadn't thought of that," and promptly vanishes in a puff of logic.
"Oh, that was easy," says Man, and for an encore goes on to prove that black is white and gets himself killed on the next zebra crossing
Ricky Gervais, Daniel Radcliffe, Billy Joel, all well and good, but my all time atheist hero is Linus Pauling. "I believe that all complicated phenomena can be explained using simpler scientific principles." That quote galvanized my atheism decades ago, and I still use it when people ask me what I believe.